Self-centering work and die holder for pipe-threading dies.



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SELF OENTERING WORK MH) DIE HOLDER POE PIPE THBBDING DIES.

APFLIGATIGB FILED JUNE 21, 1909.

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PabentedMay 10, 1916.

www mreaisgg ggmggggm. SELF ENTEEING WORK AND DIE HOLDER FOR PIPE THRBADING DIES.

l A rs a is lf L. TROU?, OF TOLEDO, OHIO, ASSIGNOR OF ONE-HAIF TO DAVIO C. WALTER,

OF TOLEDO, OHIO.

SELF-CENTERING WORK AND DIE HOLDER FOR PIPE-THREADING DIES. i

Specification of Letters Patent.

Application filed June 21, 1909. Serial No. 503,375.

To all fwhom it may concern:

Be it known that I, EDWARD L. TRoUP, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented a new and useful Improvement in Self-Centering Work and Die Holders for Pipe-Threading Dies, of which the following is a specification.

My invention relates to a self-centering work and die lead holder for pipe threading dies, and has for its object to provide a simple, convenient and efficient apparatus of thev kind, whereby the lead of a die may be firmly secured for the operation of the die, and the end portions of pipes of different diameters may be readily and automatically centered in the lead of the die in axial coincidence with the axis of the lead and rmly secured in such position independently of the lead, and whereby the use of bushings and set screws for the lead is avoided.

A further object is to provide a holder of the kind, wherein the work and the die are independently mounted and secured, and from which either may be readily removed without removing the other.

I accomplish these objects by t-he construction, arran ement and combination of parts, as hereina er described, claimed and illustrated in the drawings, in which- Figure 1 is a front elevation of a holder constructed in accordance with my invention. Fig. 2 is a top view of the same. Fig. 3 is a vertical cross section of the same on line mof Fig. 2. Fig. 4 is a similar section of the same on line y-y of Fig. 2 showing a die and a pipe mounted therein in position for the operation of threading and the holder mounted on a support. Fig. 5 is a side elevation of a holder, with the die and pipe removed. Fig. G is a side view of a die lead detached from the die head and the holder. Fig. 7 is a front elevation oi my holder made adapted to receive therein the lead of a die head of the type commonly used wherein the lead is provided with set screws for holding the work. Fig. 8 is a front elevation partly in section of a modified form of my invention wherein a combined die holder and lead that is readily attachable to and detachable from the holder base, is substituted for the holder shown in Fig. 7. Fig. 9 is a similar view of a modified form of a combined die holder and lead that is also readily attachable to and detachable from the base. Fig. 10 is a side elevation of a modified form of my holder base which is made adapted for the attachment and detachment of the lead and work holder of any of the forms of dies commonly used, by attachin to the lead a support complementary to tie modification of the base, and Fig. 11 is a front elevation of the same.

In the drawings l designates a circular disk base, adapted to be mounted on a table or other suitable support 2, and having its top provided with a concentric flange 3 forming a shallow bearing socket 4. Central of the socket the base is provided with an axial bore 5, to receive a pivot bolt 6.

In the socket bearin 4 is seated the cylindrical bearing boss of the base 8 of a holder body 9. The base 8 of the holder body is integral with the body9, and is inV Patented May 10, 1910.

the form of a disk which corresponds in diameter with the base 1, but has a segment cut away in line with the front side of the body 9, which is elongated and rectangular and has end portions 10 and 11 overhanging the base 8. The base is provided with a central counterbored orifice 8 to freceiv'e'the pivot bolt 6.

The body 9 is a hollow box having the parallel sides 12 and 12 and the end 13 at the end portion 11, and the slotted to forming guide ways 14 on which are movab y mounted the jaw head 15, having the jaw 16, and the jaw head 17, having a pair of jaws 18, complementary to the jaw 16. The jaw heads 15 and 17 are provided with slide grooves 15 to receive the guides 14. The end 13 is provided with a bore 19 in axial alinement with bores 2O in the jaw heads which are interiorly threaded respectively to receive a right and left threaded shaft 21,

having an unthreaded end extension 22l journaled in the bore 19 and having the fixed collar 23 shouldered against the inner side of the end 13 and the crank 24 detachabl mounted on the portion extending outsi e the end 13.

The front side 12 of the body 9 has integral therewith as a bracket, the lower half 25 of a die lead holder head 25. The integral portion 25 of the holder head 25 is semi-cylin drical, and is provided with the biurcated hinge ears 26 projectinor on one side, and the bifurcated latch ears 297 pro'ecting diametrically oppositely theret d" om the other I11o side, and lo the oars 2G is hinged, by a hinge pin 2S the upper semi-cylindrical hall Q5 of the holder head, having the hinge ear 26 on one side complementary to the ears 26, and the bifurcated latch ears 2T extending oppositely to the ear 26 and complementary to the latch ears 27. The latch ears 27 are perforated and have mounted therein a pivot pin Q9 upon which is plvotaliy mounted between the ears a latch bolt 29, the body of which is threaded and has adjustably threaded thereon a hollow interiorly threaded handle 30. rthe bolt 29 is of a diameter to pass between the ears 2T of the upper half 25 of the holder head, and when the handle 30 is run down 0n the bolt against the ears the hinged upper halt' 25 of the holder head is locked down upon the lower half 25. The axis of the holder head is at right angles to the vertical plane of the axis of the screw 21, and the vertical plane of the holder head intersects the screw shaft 21 at right angles central between the inner ends of the right and left threads.'

' rl`he jaws 1G and 18 have serrated V shaped grip faces the angles ot' which are egual,l and are at equal distance from the axis ot the holder head extended, and are bisected by the horizontal plane of that axis, so that when a pipe is gripped by the jaws, whatever the diameter of the pipe may be, it is automatically centered with the axis in line with the axis of the holder head.

The holder head 25 has an inner diameter adapting it to closely receive the cylindrical lead 31 of a die head and if the die lead has any special outer construction the inner wall of the holder is made complementary thereto. In Fig. 4 I have shown the lead holder adapted to the lead of a die head, wherein the lead holder is provided with an inner circumferential groove 33 to receive a complementary bead 34 on the die head. But the holder may be made to receive any special forni of die lead, and in Fig. 7 is shown a lead holder adapted to receive a die lead of the class of dies commonly used, wherein the lead is also the work holder and is provided with set screws for centering and securing the die on the pipe, the set screws being shown in that figure in dotted lines. TVhen this form of die is used in my device, the set screws may be removed.

Constructed and mounted as shown and described, and the die lead holder being tween the jaws 1G and i8, (first separated a suitable distance by a reverso turning loff, the crank 524,) with the end portion to be threaded extending into the lead 3l of the die up to the chasers. The crank 24 is then turned forward until the pipe is clamped and firmly held by the jaws 16 and` 18, aiter which the die head may be run on the pipe until the thread is formed. If a second pipe is to be threaded the die head is a ain lun out in the lead, the pipe is released :trom the jaws by a reverse movement of the crank 34 and the second pipe secured therein and threaded as described. Thus constructed it is manifest that after the operation of threading has been completed, and the chasers are withdrawn from the pipe, that either so` i the pipe may be released from the jaws andv I The base 1 is provided with. a series of holes 36 at intervals through .its rim and the base 8 is provided with a hole 37 adapted to be brought into register with any one of the holes 36, as the base 8 is revolved von the pivot bolt 6. In the hole 37 is provided a stop pin 38, which is flattened on one side to form a stop shoulder 39 and the pin is prevented from entire Withdrawal from the base by a set screw 39 in the peri hery of the base 8, opposite the flattened si e of the pin. By this construction the base l may be mounted on a pedestal su port (not shown) and the holder adjuste to receive a pipe from any radial direction. It is manifest also that without departing from the principle of operation of my invention that the functions of the lead holder 25 and the die leadSl may be combined in one element and in each of Figs. 8, 9 and 10, I have shown a combined die lead and holder. In Fig. 8 a combined lead and holder 251 is provided with a base projection 40 which is formed complementary to a dovetail groove in an integral projection 41, from the front side 12a of the body 9. In Fig. l9 a combined holder 25C is provided with the side bosses 42 which are bored to receive the pins 43 fixed in projections 44 from the front side l2" ot the body 9; and in Figs. 10 and 1l are shown a die lead 25d made adapted by a bifurcated bracket 45, secured by the screws 46 to the body of the lead and adapted to be secured to the front face 12c of the body 9 by a nut 47 on a stud bolt 48 projecting from the face 12C. In each of the combined lead and die holders 25a, 25b,`25, and 25d there is provided an interior thread 49 which forms the lead of the die head, and in the integral form 25a, if desired, the die head may be removed from the fixed holder by detaching the retaining ring 50, and

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therefore, in the embodiment of my invention, I do not limit myself to the use of a lead holder that forms an integral part of the main body portion, or that is provided with a hinged section, Wherelo it may be opened to receive the lead of a ie head.

What I claim to be new is- 1. In a self-centering work and die lead holder for threading pipes and the like, a support, a base mounted on the support, a die lead holder fixed on the base and adapted to detachably receive and secure therein the internally threaded lead of an independently usable die head therein, with the head in threaded engagement therewith and revoluble and movable progressivel' in the lead in line with its axis, and a wor .holder on the base comprising means independent of the die holder for receiving and automatically securing in fixed relation to the die lead holder cylindrical bodies of different diameters, in axial alinenient With the axis of a die secured in the die holder, substantially as set forth.

2. In a self-centering work and die lead holder for threading pipes and the like, a support, a base adjustably mounted on the support, a die lead holder fixed on the base and adapted to detachably receive and secure therein the internally threaded lead of an independently usable die head therein, with the head in threaded engagement therewith and revoluble and movable progressively in the lead in line with its axis, and

a work holder on the base comprising means independent of the die holder for receiving and automatically securing in fixed relation to the die lead holder, cylindrical bodies of different diameters, in axial alinement with the axis of the die secured in the die holder, substantially as set forth.

3. In a self-centering Work and die lead holder for threading pipes and the like, the combination of a support, a base mounted on the support, a die lead holder fixed on the base and adapted to detachably receive and secure a die head therein, With the head revoluble and movable progressively in the lead in line With its axis, said die lead holder comprising a semi-cylindrical member in-` tegral with the base, a semi-cylindrical member hinged to the integral member and means to clamp the hinge member to the integral member around the lead of a die lead, and a Work holder on the base comprising means for receiving and automatically securing pipes and the like to different diameters, in axial alinement with the axis of the die secured in the die lead holder, substantially as set forth.

In witness whereof I have hereunto si ed my name in the presence of tWo subscri ing witnesses.

EDWARD L. TROUP.

In presence of- WM. J. FRITsoHE, M. S. SMITH. 

